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A lung nodule or pulmonary nodule is a relatively small focal density in the lung. A solitary pulmonary nodule (SPN) or coin lesion, [1] is a mass in the lung smaller than three centimeters in diameter. A pulmonary micronodule has a diameter of less than three millimetres. [2] There may also be multiple nodules. One or more lung nodules can be ...
The criteria for diagnosing pulmonary adenocarcinoma have changed considerably over time. [10] [11] The 2011 IASLC/ATS recommendations, adopted in the 2015 WHO guidelines, use the following criteria for adenocarcinoma in situ: [12] tumor ≤3 cm; solitary tumor; pure "lepidic" growth* [13] No stromal, vascular, or pleural invasion
AAH is a pre-malignant cause of nodular GGO and is more commonly associated with lower attenuation on CT and smaller nodule size (<10 mm) compared to adenocarcinoma. [10] In addition, AAH often lacks the solid features and spiculated appearance that are often associated with malignant growths. [9]
A 2022 report from the American Lung Association indicated that only 5.8% of Americans had been screened for lung cancer and that in some states, rates were as low as 1%.
Bronchoscopy is not usually useful as these lesions tend to lie in the perifery of the lung. Fine needle aspirates may be not be sufficient to make the diagnosis. [7] [8] Blood tests are normal. CT shows a solitary nodule with may have some calcium present. PET scans may be positive. [9] [10]
A lung cyst, or pulmonary cyst, encloses a small volume of air, and has a wall thickness of up to 4 mm. [3] A minimum wall thickness of 1 mm has been suggested, [3] but thin-walled pockets may be included in the definition as well. [4] Pulmonary cysts are not associated with either smoking or emphysema. [5]